Just recently I upgraded the forum to it's latest final version (Nexus 1.9.5). Apparently, the attachment size was initially set to not allow for
anything bigger than 50KB (very small). That would probably allow for nothing more than a large image file.
If you were trying to attach MP3 files and getting an error message, that was due to the setting that I needed to modify to allow for bigger files.
Now attachments can be uploaded as long as they are less than 1MB. I apologize for any inconvenience.
